Just a quick video to show how us hobbyists can charge drill batteries with simple, inexpensive power supply boards. Also in this video is how a generic Chinesium charger works.
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When you gave the all s*** I subbed that's awesome
Is he going to get to the point blah blah blah
I got inspired by your video to boost my old drill batteries that haven't worked in years and i just got them working today! Thanks very much for your video!
I really think you should go should come with a warning don't try this at home at least not this way
It's a good video for someone that doesn't really know what's going on but I was looking for something specific I have some Ridgid 18v batteries that the chargers stop working and I'm not quite qualified to fix them I looked but couldn't figure it out but I have boost and buck converters that can limit current hey actually you just pulled out the same one I have and use for most things but these batteries have MOSFETS that after I start pushing 21v to it it takes it for l don't know like 10 seconds to maybe a minute it stops taking current it has been a while and I just figured out none of my chargers work so Im sure it has some pin probably temp sensor or something that wants something probably a resistance but haven't found that data yet
Help. "Can I use a 12.5v charger on a 6v battery for a 6v craftsman 3/8" drill?
I wouldn't be surprised at all if your battery(s) last 5 years charging @250ma..the touted high end 30 min and 1 hr chargers kill more cells than all other causes combined and trades people go through batteries like they were Skittles..ofcourse when shopping pros look for the best battery warranties so can just swap them in for new ones..BTW I have NiCd's that are decades old and still almost as good as new…they have never been fast charged or over charged..
Don’t waste your time buying cheap Chinese tools . Buy the best you can afford !
Why you talk too much. Just STICK with the point…
Thanks for your great explanation. I'm a novice at electronics and 78 years old so I have to go very slow and you made it very understandable.
For crying out loud, just get to the point! I’ve been known to get on a tangent, but you’re next level!
Too bad these batteries weren't standardized for consumers ease of use and safety.
I bought 2 of those walmart drills on sale too, they have lasted longer than my Dewalts, bang for your buck.
This is me, with no charger!
lmao i ahd the same hyper tough drill with the charger and i took it apart to make a charger for my impact drill both 20v
You are great thank you so much for sharing your knowledge you have been teaching me so much thank you thank you
those chargers are only 400 mA? I believe my Dewalt 20 volt max charger does 4 amps I think. It only takes 75 minutes to charge a 5AH battery.
Good Video!!!
there is actually a bit more going on inside these batteries that is good to know, in most cases the packs have a built in BMS and balancing circuit hence the separate charge pin, there is a higher voltage on the charger to make sure the charging is complete and quicker and when the pack is near it´s full charge the balancing is done, if the cells are drifting in voltage it evens them out and if you charge these packs on the output pins you won´t get proper balancing and it can lead to damage but sure this is a bit different between brands and how it is made. some chargers and batteries has a whole bunch of pins and can be separate balancing or temperature monitoring whichever can be built into the battery or the charger itself. so in conclusion the best option is to use a real charger made for the battery or if you do it yourself figure out how the battery bms is made to work and use the correct charging input for it. usually the battery has built in over and under voltage protection, it gonna turn off if too much discharged and it should also cut charging if the voltage goes too high, however if you charge on these outputs it may not be able to shut down over charge or unbalanced cells causing a fire hazard or damage to your equipment. so basically if you are not 100% sure what you are doing then prefer a dedicated charger made for this battery 🙂
Jesus just buy a charger.
Wake me up when you get to the changing part
an ''official'' Makita charger does something additional
– it checks the temperature, and regulates the current in behalf of the cell temperature and the possible currents without damaging the cells
– it don't charge the battery at all if it's too cold (around – 5 ° C)
– it cools down the cells first before charging if they are too hot
– it reduces the current if the SOC has reached 80 %
My batteries from 2015 are still perfectly fine despite they have been used commercially on construction sites for more than 5 years, always charged in a original Makita charger
Heuu . . . évite les chargeurs Chinois, ils peuvent bruler !
Uh. . . avoids Chinese chargers, they can burn!
Charging A Drill Battery Without An "Official" Charger
You can only do this with cheap batteries without the protection circuits of the big brand tools. Get a imax RC charger and you can safely charge any of these " unlocked " batteries of any type any voltage.
Couple of additional points: 1. Don't trust the accuracy of cheap multimeters until you have checked them, 2. Don't charge really flat lithium batteries at the normal current rate.
Most chargers will not charge a really flat lithium battery at all making them seem dead. Reality is that cells will often come back if not left flat for too long nor reverse charged. Key point is to start with a really low current like 50ma until you get past 2 to 2.5v per cell. Lastly if you look for a "Boost" converter you can charge from a more common wall psu like 12v, though you still need the "CC" (constant current) control to set current.
I use a bench power supply. You can set the voltage and current limit. My power supply supply is 0 to 50 volts dc and only 1.5 amp max. . I usually set the current between 650 ma to 1 amp. I have been charging li ion batteries for years this way. By the way my power supply is from the 1970's with an analog meter. Buy a cheap Chinese model power supply with at least 0-30 volts and 3 amp capacity. Well worth it. Thanks for the video, not bad.
You know what your doing but I am not sure where the 4.11 volts came from. ALL 18650 or 18750 batteries I have used are marked for 3.7 v and test out to 3.7 to 3.9 v.
Nice theory, but…… I tried that with my Ryobi and the BMS won't let any current in. I'll have to build something to take it.
I’ve popped loads of them modules lol
Why are you checking a battery voltage without putting a load on it? The battery could have a very large internal impedance which would drop most of the voltage across it if a load was attached to the terminals.
Any idea how to convert batteries/chargers into a poor man's UPS (uninterruptible power supply)? I have a handful of Milwaukee m18 batteries sitting around that would be nice to get an extra purpose out of. They sell the single battery compact inverter, but is there a way to get their standard chargers to give AC power? They also sell a 6 battery sequential charger that would be a great emergency power source, but I guess they didn't enable that option so they could more easily sell their larger inverter unit that uses the different "MX fuel" batteries. Combining their compact inverter and sequential charger into one unit would be an awesome way to give a second purpose to extra batteries.
I purchased a Chinese knock-off Makita battery with 15 Li-ion elements inside, 9.0 Ah. Heavy, I know.
With a knock-off Makita charger it charges in a couple of hours.
That's the point, you don't have all day to charge your batteries.
If I dont have a multimeter … and I have a craftsman V20 battery that needs charged can I use a say 20 Volt DeWalt battery charger to charge it using alligator clips to the pins from charger to the pins on the battery (+ to + and – to -) and charge it ? It should shut off at the voltage correct?
Great video! Thanks! When the battery reaches the same voltage as the power supply, the current will stop flowing. That is, current drops to zero amps. No voltage differential. You can prove this by turning your power supply up by about another tenth of a volt and current will start flowing again. As you mentioned, don't do this for too long to avoid battery damage or worse.
i think it would be more simple to just get the official charger for what you are charging